<span style="color: #222222;">US military on Tuesday said five Marines who had been missing since two planes crashed off Japan a week ago were dead.</span><br />'' <br />''<span style="color: #222222;">The announcement brings the final toll in the December 6 crash to six, with a seventh crew member rescued after the incident.</span><br />'' <br />'' <span style="color: #222222;">US Marine Corps Lieutenant General Eric Smith, commanding general of the III Marine Expeditionary Force, said incredible efforts were made by US, Japanese, and Australian forces during the search operation.</span><br />'' <br />'' <span style="color: #222222;">There are around 50,000 US troops stationed in Japan and accidents are not uncommon.</span><br />